Banking in the United States is regulated by both the federal and state governments. The five largest banks in the United States at December 31, 2011 were JPMorgan Chase, Bank of America, Citigroup, Wells Fargo, and Goldman Sachs. In December 2011, the five largest banks' assets were equal to 56 percent of the U.S. economy, compared with 43 percent five years earlier.
Can we infer the following?
The assets of the five largest banks increased by 12% between December 2006 and December 2011

Possible answers:
 (1). Yes;
 (2). It's impossible to say;
 (3). No;
The answer is:
(2).